Traffic shaper QoS questions

After reading http://wiki.mikrotik.com/wiki/NetworkPro_on_Quality_of_Service I want to apply in a border router… Then reading this:

/queue simple
add target=192.168.1.1/32 burst-limit=100M/100M burst-threshold=10M/10M burst-time=1m/1m limit-at=2M/2M max-limit=10M/10M
add limit-at=500k/500k max-limit=1M/1M packet-marks=priority1_mark parent=queue1 priority=1/1 target=ether1_local total-priority=1
add limit-at=500k/500k max-limit=1M/1M packet-marks=priority4_mark parent=queue1 priority=4/4 target=ether1_local total-priority=4
add limit-at=500k/500k max-limit=3M/3M packet-marks=priority2_mark parent=queue1 priority=2/2 target=ether1_local total-priority=2
add limit-at=500k/500k max-limit=5M/5M packet-marks=priority6_mark parent=queue1 priority=6/6 target=ether1_local total-priority=6

I want to shape WAN traffic (not per customer)… I have 175 Mbps down / 25 Mbps up and when congestion occours I need to priorize by html, voip… but not per customer, first question, wich is my target? If I put all may customers public IPs I’ll have a problem because I have customers with 6 Mbps connections and 4 Mbps connections…
I only want to priorize in general my 175 Mbps down / 25 Mbps up regardless of my customer connections…
Sorry for my english and thanks in advance.

target maybe interface of the lan side???

and what about if I dont set limits limit-at, max-limit at child queues?

somebody out there???